90870528851 has 4 divisors (see below), whose sum is σ = 90871696632. Its totient is φ = 90869361072.

The previous prime is 90870528839. The next prime is 90870528863. The reversal of 90870528851 is 15882507809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15882507809 = 7 ⋅2268929687.

It is an interprime number because it is at equal distance from previous prime (90870528839) and next prime (90870528863).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90870528851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90870528793 and 90870528802.

It is not an unprimeable number, because it can be changed into a prime (90870528871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458141 + ... + 625806.

It is an arithmetic number, because the mean of its divisors is an integer number (22717924158).

Almost surely, 2^90870528851 is an apocalyptic number.

90870528851 is a deficient number, since it is larger than the sum of its proper divisors (1167781).

90870528851 is a wasteful number, since it uses less digits than its factorization.

90870528851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167780.

The product of its (nonzero) digits is 1612800, while the sum is 53.

The spelling of 90870528851 in words is "ninety billion, eight hundred seventy million, five hundred twenty-eight thousand, eight hundred fifty-one".